Changing the name of the major folders (those that poser expects to find automatically) will almost definitely cause a problem. Changing the names of files/folders within folders will not cause a problem unless some other file refers to that file folder. Windows file/folder names are case insensitive. for windows "A" = "a". Poser's filing system is case sensitve. "A" most certainly does not = "a". (guess: this is most probably likely to be due to the fact that Poser has to work cross-platform,; Windows is case insensitive, but Unix (and the Mac) is not.) Since the original post was about the ordering of files within the (poser) libraries, the answer is: No. You can't do that within Poser. What you CAN do though is re-name the various files/sub-folders (using an external app. eg, if you're using windows, the explorer) within the top-level folder. The only problem I ever had using this approach was with the DAZ inj/rem all MAT poses. The original files expected to be able to find the various sub-files where the installer had loaded them. (I found an update on the DAZ site which appeared to cure this, but by then I'd already edited the inj/rem all pz2s so that they worked.) Sorry if this post seems garrilous and unconnected; it isn't (but my mind is a little..) Cheers, Diolma